How does the Global Positioning System allow geologists to measure the velocity at which a plate is moving in the present world?
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How does the Global Positioning System allow geologists to measure the velocity at which a plate is moving in the present world?
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- as the pacific tectonic plate subducts under the philippine plate. south america is drifting closer to asia at a rate of approximately 4 centimeters per year. if this drift rate remains constant how much closer will asia and south america be to one another 100 million years from now?A chain of undersea volcanoes has a length of 7,400 km today and the first volcano formed 53 million years ago. How fast is the plate moving each year? (Enter your answer in cm/yr.)As you move from the surface of the Earth to the inner core, what happens to the density of the materials that make up each layer
- Volcanic rock is found to have a ratio of parent K-40 to daughter Ar-40 of 1/7. What is the minimum age of the rock? The half-life of K-40 is 1.3 billion years.What is remanent magnetism? How can it be used to track the movement of continents over time?The theory of plate tectonics states that Earth’s plates are always in motion. What geological evidence supports this statement?
- If the Atlantic seafloor is spreading at 2.9 cm/year and is now 6,350 km wide, how long ago (in years) were the continents in contact? .......yr How does that time span compare to the age of Earth? (Enter your answer as a fraction of Earth's age.)You want to use radiometric dating to determine the age of a specimen. You use Isotope Z, which has a half-life of 645 years. You measure your sample and find that 1/16 of the original amount of Isotope Z is present. How old is the sample?